Specifics of impact of investments on an economic environment consist that at the time of their implementation demand for the benefits will increase, and the offer of the benefits will increase only after a while when new capacities take effect.
Demand for investments - the most changeable part of cumulative dumping for the benefits. Investments most strongly react to change of an economic environment. On the other hand, changes of the volume of investment most often are the reason of tactical fluctuations.
As savings are not consumed part of the income, to each function of consumption there corresponds the function of savings which is brought by means of subtraction out of function of the located income of function of consumption.
Let some investment project demand K0 investments in the current period and promises to give in the next three periods according to P1, P2, P3 of net income. Then the investor will consider this project economically expedient, if
Nevertheless the consumption function constructed according to a hypothesis of the absolute income is considered extremely simplified today. One of modern options of approaches to creation of function of consumption is that three types of this function distinguish: short-term, long-term and function of consumption taking into account the different income of the population (income function).